The network condition checks if the field is in a certain IP network range.
Both IPv4 and IPv6 addresses are supported. The network range may be specified
using CIDR notation, like "192.0.2.0/24" or "2001:db8::/32", or by using one of
these named ranges:

loopback - Matches loopback addresses in the range of 127.0.0.0/8 or
::1/128.